This product MH-M18 is a low-power Bluetooth design solution that supports the latest Bluetooth 4.2 transmission, supports Bluetooth automatic reconnection technology, and supports dual channel stereo lossless playback. After the module is connected to Bluetooth, it can quickly achieve Bluetooth wireless transmission, which is very convenient. In an open environment, the Bluetooth connection distance can reach up to 20 meters. Widely used in various Bluetooth audio reception, various audio DIY modifications, etc.Welcome to your kindly inquiry : )